Filenary

MP4 to FLAC Converter

Convert MPEG-4 video files to FLAC audio right in your browser — free, private and with no size limit.

Drop your file here

or click to browse

Choose File

On first use, a ~30 MB conversion engine is downloaded to your browser (one time only).

This file is processed in your browser and never uploaded to a server.

How to convert MP4 to FLAC

  1. 1Drop your MP4 file into the box above, or click to choose it from your device.
  2. 2Click Convert. The conversion runs locally in your browser — nothing is uploaded.
  3. 3Download your new FLAC file as soon as it's ready.

Why convert MP4 to FLAC?

MP4 files can be larger than newer formats like WebM at the same quality. FLAC keeps perfect CD-quality sound at around half the size of WAV.

Why people make this conversion

Archive a video's soundtrack bit-for-bit: FLAC preserves every sample of the original audio.

The size math: MP4 vs FLAC

A minute of MP4 video weighs about 9 MB; its soundtrack alone as FLAC is 5.5 MB. Extracting audio shrinks the file about 1.6× smaller.

What is MP4?

MP4 is the most compatible video format, using H.264 video and AAC audio. It plays on every phone, browser, TV and social network.

  • MIME type: video/mp4
  • Standardized: 2001 (MPEG-4 Part 14)
  • Usual codecs: H.264 or H.265 video plus AAC audio
  • The universal container: phones, TVs and editors all accept it

What is FLAC?

FLAC is a lossless audio format that compresses audio to about half the size of WAV without losing any quality.

  • MIME type: audio/flac
  • Released: 2001 by Xiph.Org Foundation
  • Lossless: shrinks WAV by 40–60% without losing a sample
  • The audiophile archiving standard

Frequently asked questions

Is this MP4 to FLAC converter free?
Yes, it's completely free with no sign-up, no watermark and no daily limits.
Are my MP4 files uploaded to a server?
No. The conversion happens entirely inside your browser, so your files never leave your device.
Is there a file size limit?
Filenary sets no limit — even files over 1 GB work. The only practical limit is your device's memory.
Will converting MP4 to FLAC reduce the quality?
FLAC is a lossless format, so no extra detail is thrown away during the conversion — the result looks exactly like the source.
Can I convert several MP4 files at once?
This converter handles one file at a time. When it's done, click Start over to convert the next MP4 file.
Does it work on iPhone, Android, Mac and Windows?
Yes. It runs in any modern browser — Chrome, Safari, Edge or Firefox — on phones, tablets and computers, with nothing to install.

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Copy the code below and paste it into any page. It's free, needs no sign-up, and files are processed in your visitors' own browsers.